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A BGK would quickly outgrow a 70 gallon tank, and most likely eat Rams or Kribs when it got large enough. A black or brown African knife would be a much better fit. A Macana zebra knife would also work if you could find one.

What about an Ornate Bichir? :) I'm going to live vicariously through your large tank since I'll probably never have one that size... a friend of mine has one and she says when she comes home from work and it's feeding time he begs like a little dog. I've also heard Ornates tend to stay a little smaller than Senegal/Dinosaur Bichirs...